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The authors restudied the zonal distribution of ore contents in the Mozumi mining area, using the distribution of ρPb defined as Pb%÷(Pb%+Zn%)×100 and other methods. The results are as follows.<BR>1) From the ρPb distribution, it is suggested that there are two mineralized zones in the Mozumi mining area. The relation between the ρPb distribution and grade-and-size of ore deposits indicates that there were three stages of the mineralization.<BR>2) It had been predicted from the ρPb distribution by the authors that there should be a new mineralized zone in the periphery of the Mochigakabe granite porphyries, located in the footwal.l side of the Kita No. 20 fault. We believe the orebodies being found at -500 meter level may be parts of the predicted ore deposits.<BR>3) It is evident that ρPb method is quite practical for the prospecting of ore deposits at least in the Kamioka mine. But in the zones as low as below 10 of ρPb value, the zonal distribution is not clear and it is recommended to apply other indicator for the prospecting in such zones.<BR>4) Iron content in sphalerite increases towards the outer zone of the mineralization. It is thought by the authors that this is because pressure decrease played more important role than temperature change during the formation of sphalerite minerals.
資源地質学会の論文